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Original Article
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Volume 357:553-561 August 9, 2007 Number 6
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Complement C3 Variant and the Risk of Age-Related Macular Degeneration
John R.W. Yates, F.R.C.P., Tiina Sepp, Ph.D., Baljinder K. Matharu, M.Sc., Jane C. Khan, F.R.C.Ophth., Deborah A. Thurlby, R.G.N., M.Sc., Humma Shahid, M.R.C.Ophth., David G. Clayton, M.A., Caroline Hayward, Ph.D., Joanne Morgan, B.Sc., Alan F. Wright, Ph.D., F.R.C.P., Ana Maria Armbrecht, Ph.D., F.R.C.S., Baljean Dhillon, F.R.C.S., F.R.C.Ophth., Ian J. Deary, Ph.D., F.R.C.P.E., Elizabeth Redmond, R.G.N., M.Sc., Alan C. Bird, M.D., F.R.C.S., Anthony T. Moore, F.R.C.S., F.R.C.Ophth., for the Genetic Factors in AMD Study Group

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ABSTRACT

Background Age-related macular degeneration is the most common cause of blindness in Western populations. Susceptibility is influenced by age and by genetic and environmental factors. Complement activation is implicated in the pathogenesis.

Methods We tested for an association between age-related macular degeneration and 13 single-nucleotide polymorphisms (SNPs) spanning the complement genes C3 and C5 in case subjects and control subjects from the southeastern region of England. All subjects were examined by an ophthalmologist and had independent grading of fundus photographs to confirm their disease status. To test for replication of the most significant findings, we genotyped a set of Scottish cases and controls.

Results The common functional polymorphism rs2230199 (Arg80Gly) in the C3 gene, corresponding to the electrophoretic variants C3S (slow) and C3F (fast), was strongly associated with age-related macular degeneration in both the English group (603 cases and 350 controls, P=5.9x10–5) and the Scottish group (244 cases and 351 controls, P=5.0x10–5). The odds ratio for age-related macular degeneration in C3 S/F heterozygotes as compared with S/S homozygotes was 1.7 (95% confidence interval [CI], 1.3 to 2.1); for F/F homozygotes, the odds ratio was 2.6 (95% CI, 1.6 to 4.1). The estimated population attributable risk for C3F was 22%.

Conclusions Complement C3 is important in the pathogenesis of age-related macular degeneration. This finding further underscores the influence of the complement pathway in the pathogenesis of this disease.


Source Information

From the Cambridge Institute for Medical Research, University of Cambridge, Cambridge (J.R.W.Y., T.S., B.K.M., J.C.K., D.A.T., H.S., D.G.C.); the Medical Research Council Human Genetics Unit, Edinburgh (C.H., J.M., A.F.W.); the Princess Alexandra Eye Pavilion, Edinburgh (A.M.A., B.D.); the University of Edinburgh, Edinburgh (I.J.D.); the Institute of Ophthalmology, University College London (E.R., A.C.B., A.T.M.); and Moorfields Eye Hospital, London (A.C.B., A.T.M.) — all in the United Kingdom.

Drs. Yates and Sepp contributed equally to this article.

This article (10.1056/NEJMoa072618) was published at www.nejm.org on July 18, 2007.

Address reprint requests to Dr. Yates at the Department of Medical Genetics, University of Cambridge, Cambridge Institute for Medical Research, Wellcome Trust/MRC Bldg., Box 139, Addenbrooke's Hospital, Cambridge CB2 0XY, United Kingdom, or at jrwy1{at}cam.ac.uk.

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